These calculators provide estimates for planning purposes only. They use current IRS formulas and 2026 brackets, but your actual tax liability depends on many factors not captured here (credits, special deductions, AMT, etc.). Always verify with IRS worksheets or a tax professional before filing.
No. All calculations happen entirely in your browser using JavaScript. No data is sent to our servers, stored in databases, or shared with third parties. You can verify this by checking the page source - there are no external API calls for calculations.
All calculators are updated for tax year 2026, reflecting the One Big Beautiful Bill Act (OBBBA) changes that made most TCJA provisions permanent. This includes 2026 brackets, standard deductions ($16,100 single / $32,200 married), and self-employment tax rates (15.3%).
If you expect to owe $1,000 or more in tax for 2026 after subtracting withholding and credits, you generally need to make quarterly estimated payments. Use our Quarterly Tax Calculator to estimate your required payments for Q1-Q4. Missing payments can result in penalties even if you get a refund at year-end.
For 2026, the standard deduction is $16,100 (single) or $32,200 (married filing jointly). Itemizing only makes sense if your total deductions exceed these amounts. Common itemized deductions include mortgage interest, state/local taxes (capped at $10,000), charitable donations, and medical expenses exceeding 7.5% of AGI. Use our Standard vs Itemized calculator to compare.
The self-employment tax rate remains 15.3% for 2026: 12.4% for Social Security (up to the wage base of $176,100) and 2.9% for Medicare (no cap). High earners above $200,000 single / $250,000 married pay an additional 0.9% Medicare surtax. You can deduct 50% of your SE tax on your return.
The 2026 quarterly due dates are: Q1 - April 15, Q2 - June 15, Q3 - September 15, Q4 - January 15, 2027. If a due date falls on a weekend or holiday, the payment is due the next business day. Use Form 1040-ES or our calculator to determine the amount.
Yes, if you use part of your home exclusively and regularly for business. You can use the simplified method ($5 per square foot, max 300 sq ft = $1,500) or actual expenses (percentage of home costs). The simplified method is easier; actual expenses often yield larger deductions but require detailed records.
Absolutely. States have wildly different tax regimes - nine states have no income tax (including Texas, Florida, Nevada), while California and New York have high marginal rates. If you move mid-year, you may need to file part-year resident returns in both states. Our State Tax Comparison tool shows the effective tax burden by state.
No. Tax Calc Tool is an independent educational resource created by a former IRS Revenue Agent, but we have no official affiliation with the Internal Revenue Service, any state tax agency, or any tax preparation company. The calculators are for estimation and planning only.
No. We share general tax information and calculators for educational purposes only. We do not provide personalized tax advice, tax preparation services, or legal counsel. For your specific situation, please consult a qualified CPA, Enrolled Agent, or tax attorney.
We update calculators annually when the IRS releases inflation adjustments (typically October/November for the following tax year). We also make immediate updates for major tax law changes like the OBBBA. Each calculator page shows the last updated date.